Vendor import of OpenPAM Calamite

1 files changed, 227 insertions, 0 deletions

diff --git a/contrib/openpam/lib/openpam_load.c b/contrib/openpam/lib/openpam_load.c
new file mode 100644
index 0000000..d938959
--- /dev/null
+++ b/contrib/openpam/lib/openpam_load.c
@@ -0,0 +1,227 @@
+/*-
+ * Copyright (c) 2002 Networks Associates Technologies, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by ThinkSec AS and
+ * NAI Labs, the Security Research Division of Network Associates, Inc.
+ * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
+ * DARPA CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id$
+ */
+
+#include <dlfcn.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <security/pam_appl.h>
+
+#include "openpam_impl.h"
+
+#ifdef OPENPAM_STATIC_MODULES
+SET_DECLARE(_openpam_modules, pam_module_t);
+#endif
+
+const char *_pam_sm_func_name[PAM_NUM_PRIMITIVES] = {
+	"pam_sm_acct_mgmt",
+	"pam_sm_authenticate",
+	"pam_sm_chauthtok",
+	"pam_sm_close_session",
+	"pam_sm_open_session",
+	"pam_sm_setcred"
+};
+
+static pam_module_t *modules;
+
+/*
+ * Load a dynamic module, or locate a static one.  Keep a list of
+ * previously found modules to speed up the process.
+ */
+
+static pam_module_t *
+openpam_load_module(const char *path)
+{
+	pam_module_t *module;
+	void *dlh;
+	int i;
+
+	/* check cache first */
+	for (module = modules; module != NULL; module = module->next)
+		if (strcmp(module->path, path) == 0)
+			goto found;
+
+	/* nope; try to load */
+	if ((dlh = dlopen(path, RTLD_NOW)) == NULL) {
+		openpam_log(PAM_LOG_ERROR, "dlopen(): %s", dlerror());
+	} else {
+		if ((module = calloc(1, sizeof *module)) == NULL)
+			goto buf_err;
+		if ((module->path = strdup(path)) == NULL)
+			goto buf_err;
+		module->dlh = dlh;
+		for (i = 0; i < PAM_NUM_PRIMITIVES; ++i)
+			module->func[i] = dlsym(dlh, _pam_sm_func_name[i]);
+	}
+	openpam_log(PAM_LOG_DEBUG, "%s dynamic %s",
+	    (module == NULL) ? "no" : "using", path);
+
+#ifdef OPENPAM_STATIC_MODULES
+	/* look for a static module */
+	if (module == NULL && strchr(path, '/') == NULL) {
+		pam_module_t **modp;
+		
+		SET_FOREACH(modp, _openpam_modules) {
+			if (strcmp((*modp)->path, path) == 0) {
+				module = *modp;
+				break;
+			}
+		}
+		openpam_log(PAM_LOG_DEBUG, "%s static %s",
+		    (module == NULL) ? "no" : "using", path);
+	}
+#endif
+	if (module == NULL)
+		return (NULL);
+	module->next = modules;
+	module->prev = NULL;
+	modules = module;
+ found:
+	++module->refcount;
+	return (module);
+ buf_err:
+	openpam_log(PAM_LOG_ERROR, "malloc(): %m");
+	dlclose(dlh);
+	free(module);
+	return (NULL);
+}
+
+
+/*
+ * Release a module.
+ * XXX highly thread-unsafe
+ */
+
+static void
+openpam_release_module(pam_module_t *module)
+{
+	if (module == NULL)
+		return;
+	--module->refcount;
+	if (module->refcount > 0)
+		/* still in use */
+		return;
+	if (module->refcount < 0) {
+		openpam_log(PAM_LOG_ERROR, "module %s has negative refcount",
+		    module->path);
+		module->refcount = 0;
+	}
+	if (module->dlh == NULL)
+		/* static module */
+		return;
+	dlclose(module->dlh);
+	if (module->prev != NULL)
+		module->prev->next = module->next;
+	if (module->next != NULL)
+		module->next->prev = module->prev;
+	free(module);
+}
+
+
+/*
+ * Destroy a chain, freeing all its links and releasing the modules
+ * they point to.
+ */
+
+static void
+openpam_destroy_chain(pam_chain_t *chain)
+{
+	if (chain == NULL)
+		return;
+	openpam_destroy_chain(chain->next);
+	chain->next = NULL;
+	while (chain->optc--)
+		free(chain->optv[chain->optc]);
+	free(chain->optv);
+	openpam_release_module(chain->module);
+	free(chain);
+}
+
+/*
+ * Add a module to a chain.
+ */
+
+int
+openpam_add_module(pam_handle_t *pamh,
+	int chain,
+	int flag,
+	const char *modpath,
+	int optc,
+	const char *optv[])
+{
+	pam_chain_t *new, *iterator;
+
+	if ((new = calloc(1, sizeof *new)) == NULL)
+		goto buf_err;
+	if ((new->optv = malloc(sizeof(char *) * (optc + 1))) == NULL)
+		goto buf_err;
+	while (optc--)
+		if ((new->optv[new->optc++] = strdup(*optv++)) == NULL)
+			goto buf_err;
+	new->optv[new->optc] = NULL;
+	new->flag = flag;
+	if ((new->module = openpam_load_module(modpath)) == NULL) {
+		openpam_destroy_chain(new);
+		return (PAM_OPEN_ERR);
+	}
+	if ((iterator = pamh->chains[chain]) != NULL) {
+		while (iterator->next != NULL)
+			iterator = iterator->next;
+		iterator->next = new;
+	} else {
+		pamh->chains[chain] = new;
+	}
+	return (PAM_SUCCESS);
+
+ buf_err:
+	openpam_log(PAM_LOG_ERROR, "%m");
+	openpam_destroy_chain(new);
+	return (PAM_BUF_ERR);
+}
+
+
+/*
+ * Clear the chains and release the modules
+ */
+
+void
+openpam_clear_chains(pam_handle_t *pamh)
+{
+	int i;
+
+	for (i = 0; i < PAM_NUM_CHAINS; ++i)
+		openpam_destroy_chain(pamh->chains[i]);
+}